v Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See Chapter 3, “Parts listing, System x3350 Type 4192 and 4193 server,” on page 45 to determine whichcomponents are customer replaceable units (CRU) and which components are field replaceable units(FRU).v If an action step is preceded by “(Trained service technician only),” that step must be performed only by atrained service technician.System event/error log message ActionVRD critical under voltage fault 1. (Trained service technician only) Reseat the microprocessor.2. (Trained service technician only) Replace the system board.Solving power problemsPower problems can be difficult to solve. For example, a short circuit can existanywhere on any of the power distribution buses. Usually, a short circuit will causethe power subsystem to shut down because of an overcurrent condition. Todiagnose a power problem, use the following general procedure:1. Turn off the server and disconnect all ac power cords.2. Check for loose cables in the power subsystem. Also check for short circuits, forexample, if a loose screw is causing a short circuit on a circuit board.3. Remove the adapters and disconnect the cables and power cords to all internaland external devices until the server is at the minimum configuration that isrequired for the server to start (see “Solving undetermined problems” on page220 for the minimum configuration).4. Reconnect all ac power cords and turn on the server. If the server startssuccessfully, install the adapters and devices one at a time until the problem isisolated.If the server does not start from the minimum configuration, replace the componentsin the minimum configuration one at a time until the problem is isolated.Solving Ethernet controller problemsThe method that you use to test the Ethernet controller depends on which operatingsystem you are using. See the operating-system documentation for informationabout Ethernet controllers, and see the Ethernet controller device-driver readme file.Try the following procedures:v Make sure that the correct device drivers, which come with the server areinstalled and that they are at the latest level.v Make sure that the Ethernet cable is installed correctly.– The cable must be securely attached at all connections. If the cable isattached but the problem remains, try a different cable.– You must use Category 5 cabling.– If you directly connect two servers (without a hub), or if you are not using ahub with X ports, use a crossover cable. To determine whether a hub has anX port, check the port label. If the label contains an X, the hub has an X port.v Determine whether the hub supports auto-negotiation. If it does not, tryconfiguring the integrated Ethernet controller manually to match the speed andduplex mode of the hub.v Check the Ethernet controller LEDs on the rear panel of the server. These LEDsindicate whether there is a problem with the connector, cable, or hub.Chapter 5. Diagnostics 219
